By Jack Nutting
The Cocoa frameworks are probably the most strong for growing local OS X apps to be had at the present time. despite the fact that, for a first-time Mac developer, simply firing up Xcode four and beginning to browse the documentation could be a daunting and not easy activity. The Objective-C classification reference documentation by myself may fill hundreds of thousands of published pages, let alone the entire different tutorials and publications integrated with Xcode. the place do you begin? Which sessions are you going to want to take advantage of? How do you employ Xcode and the remainder of the instruments?
Learn Cocoa for the Mac, moment version, completely revised for OS X Mountain Lion and XCode 4, solutions those questions and extra, assisting you discover your means throughout the jungle of sessions, instruments, and new innovations so you might start at the subsequent nice OS X app this day. Jack Nutting and Peter Clark are your publications via this wooded area; Jack and Peter have lived right here for years, and may express you which of them boulder to push, which vine to cut, and which circulation to drift throughout with the intention to make it via. you are going to research not just tips on how to use the parts of this wealthy framework, but in addition which ones healthy jointly, and why.
Jack Nutting's procedure, combining pragmatic problem-solving with a deep recognize for the underlying layout philosophies contained inside of Cocoa, stems from years of expertise utilizing those frameworks. Peter Clark will convey you which of them elements of your app require you to leap in and code an answer, and which components are top served via letting Cocoa take you the place it wishes you to head. the trail over what seems like a mountain of elements and APIs hasn't ever been extra completely ready to your travels. In each one bankruptcy, you are going to construct an app that explores a number of parts of the Cocoa panorama. With Jack's and Peter's suggestions, the steep studying curve turns into a satisfying event. there's nonetheless a lot paintings for the uninitiated, yet by the point you are performed, you may be good in your solution to turning into a Cocoa master.
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Additional resources for Learn Cocoa on the Mac
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Resizing the slider to fill up the window CHAPTER 3: Lights, Camera … Actions! (and Outlets, too) Take a look at the Attributes Inspector for the Slider in the Utility area (see Figure 3-12). By default, the slider values range from 0 to 100, but we can change these, if we wish, to any integer values. Under the Control section, check the checkbox labeled Continuous. Figure 3-12. Attribute Inspector for a slider Now we’re about to work some magic. We’re going to connect the slider to the text field.
This function contains only one line of code, which calls a function named NSApplicationMain(). That function, which is part of Cocoa, automatically creates an instance of NSApplication for us. That instance of NSApplication goes into a loop and continuously polls for events from the keyboard, mouse, operating system, and other applications, and then responds to those events (don’t worry about the specifics for now; we’ll learn more about events later in the book). When it detects an event that signifies that the application should quit, the event loop stops and the application’s execution ends.
Control-drag again from the slider up to the text field, and this time pick the takeIntValueFrom: action from the gray window (Figure 3-17). Note that there are actually two actions with similar names,takeIntValueFrom: and takeIntegerValueFrom:. They differ in whether the text field asks the slider for its value as an int, or as an NSInteger. Either one will do for our purposes. This will replace the connection we made previously, as the slider can have only one target at a time. 44 CHAPTER 3: Lights, Camera … Actions!